asp.net C#中 PictureBox控制項拖動與圖片拖動代碼

 

思路是這樣的.得有三個變數.
記錄x座標: int xPos;
記錄y座標: int yPos;
記錄是否按下滑鼠: bool MoveFlag;

代碼如下

複製代碼

//在picturebox的滑鼠按下事件裡,記錄三個變數. private void picBox_MouseDown(object sender, MouseEventArgs e) {     MoveFlag = true;//已經按下.     xPos = e.X;//當前x座標.     yPos = e.Y;//當前y座標. } //在picturebox的滑鼠按下事件裡. private void picBox_MouseUp(object sender, MouseEventArgs e) {     MoveFlag = false; } //在picturebox滑鼠移動 private void picBox_MouseMove(object sender, MouseEventArgs e) {     if (MoveFlag)     {         picBox.Left += Convert.ToInt16(e.X - xPos);//設定x座標.         picBox.Top += Convert.ToInt16(e.Y - yPos);//設定y座標.     } }

這樣就可以實現控制項在容器裡的移動

在pictureBox中拖動圖片的實現代碼     bool wselected = false;

代碼如下

複製代碼

Point p = new Point();         private void pictureBox1_MouseDown(object sender, MouseEventArgs e)         {             pictureBox1.Cursor = Cursors.Hand; //按下滑鼠時，將滑鼠形狀改為手型             wselected = true;             p.X = e.X;             p.Y = e.Y;         }         int driftX = 0, driftY = 0;         int mx = 0, my = 0;         private void pictureBox1_MouseMove(object sender, MouseEventArgs e)         {             if (wselected)             {                 driftX = p.X - e.X;                 driftY = p.Y - e.Y;                 mx = mx - driftX;                 my = my - driftY;                 Bitmap bm = new Bitmap(this.pictureBox1.Image);                 Graphics g = pictureBox1.CreateGraphics();                 g.Clear(pictureBox1.BackColor);                 g.DrawImage(bm, mx, my);                 p.X = e.X;                 p.Y = e.Y;                 bm.Dispose();                 g.Dispose();             }         }         private void pictureBox1_MouseUp(object sender, MouseEventArgs e)         {             pictureBox1.Cursor = Cursors.Default; //鬆開滑鼠時，形狀恢複為箭頭             wselected = false;         }